Patents by Inventor William Keyser

William Keyser has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Two-piece clamp ring for holding semiconductor wafer or other workpiece
    Patent number: 6231038
    Abstract: A clamp ring assembly for securing a generally circular workpiece to a supporting surface comprises an annular base ring having a radial inner surface of a predetermined diameter and at least one locking member. The base ring further includes at least one opening extending axially therethrough for securing the base ring to the supporting surface. An annular securing ring having a radial outer surface and a radial inner surface is provided. The diameter of the outer surface of the securing ring is the same as or slightly smaller than the diameter of the inner surface of the base ring and the securing ring includes at least one locking member for engaging the locking member of the base ring when the securing ring is assembled with the base ring. The securing ring also includes at least one workpiece engaging member for engaging and holding the workpiece against the supporting surface.
    Type: Grant
    Filed: November 23, 1999
    Date of Patent: May 15, 2001
    Assignee: Greene Tweed of Delaware, Inc.
    Inventors: William Keyser, Kenneth Murphy, Timothy Edwards